My cheap solution was to build a cylinder out of 1/2 inch hardware cloth about 8 inches tall, and rest the heat lamp bulb inside the opening at the top, it moves the light far enough away that the ambient and hotspots drop by almost 8 F for me. I have a dimmer switch on the light as well, it takes a bit of calculation/trial but you get a good, steady temp after messing with it.
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